A model has her hair done backstage before Christian Dior's Haute Couture Spring-Summer 2017 live show to celebrate Dior's new flagship store at the Ginza Six mall in Tokyo, Japan, April 19, 2017. REUTERS/Toru Hanai

A model has her hair done backstage before Christian Dior's Haute Couture Spring-Summer 2017 live show to celebrate Dior's new flagship store at the Ginza Six mall in Tokyo, Japan, April 19, 2017. REUTERS/Toru Hanai